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program hadley3 |
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c*** This subroutine calculates analysis errors using greg's |
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c*** ensemble square root filter, or the traditional ensemble |
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c*** kalman filter. |
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c*** |
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c*** Written by: Sai Ravela |
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c*** Last modified: Feb 2, 2003 |
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implicit none |
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integer i, j, k, n, ijim, ijuli, isteps, nens, ics |
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integer nx, ny, nz, nf, nnx, nny, nnz, mobs, isai |
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integer ii, jj, zob, xob, yob |
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#include "hadley3.h" |
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integer iobsloc(mobs), indxa |
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real*8 ytrue(n), yobs(mobs), ytmp(n) |
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real*8 pert(n), R(mobs), yobsfull(n), ave(n), var(n) |
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real*8 xens(n,nens) |
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real*8 var_obs, eps, dt, x |
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real*8 obserr, analerr, distsub, distobs |
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integer iret, system |
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real*4 mask(ny,nx) |
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c*** open some output files |
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open(unit=2,file='test.dat',status='unknown') |
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c open(unit=3,file='fields.dat',status='unknown') |
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c*** initialisations |
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eps=0.005 ! obs error - 1/2 mm/s |
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isteps=1 ! number of steps per obs cycle |
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c*** Here is where you read iobsloc and corresponding |
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c variances. You should know |
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c mobs in advance...in hadley |
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call ReadObs(3,mobs,iobsloc) |
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write (*,*) 'iobsloc set',mobs, iobsloc(mobs), nens |
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var_obs=eps**2 |
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do i=1,mobs |
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if (iobsloc(i) < nx*ny*nz*3) then |
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R(i)=var_obs |
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else |
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R(i) = 0.1 ! 0.9 deg other |
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end if |
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enddo |
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c*** loop over initial conditions |
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do ijim=1,ics |
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call ReadPickup(0,n,nx,ny,nz,ytrue) |
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write (*,*) 'Picked Truth' |
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do k = 1,mobs |
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indxa = iobsloc(k) |
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yobs(k) = ytrue(indxa) |
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end do |
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do isai=1,nens |
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call ReadPickUp(isai,n,nx,ny,nz,ytmp) |
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do k=1,n |
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xens(k,isai)=ytmp(k) |
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enddo |
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enddo |
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write (*,*) 'Picked Ensemble' |
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call EnSRF3d(xens,yobs,iobsloc,n,mobs,R,nens,nx,ny,nz,mask) |
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c*** get ensemble mean and variance |
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call ranmean2(xens,ave,n,nens) |
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c*** calculate obs and anal err |
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analerr=distobs(yobs,ave,iobsloc,mobs,n) |
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write(6,*) ijim, analerr |
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write(2,*) ijim, analerr |
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analerr=distsub(ytrue,ave,n) |
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write(6,*) '>',ijim, analerr |
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write(2,*) '>',ijim, analerr |
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c write(3,'(250f18.10)') (ave(i), i=1,n) |
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c*** step truth forward |
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call Model(0) |
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call ReadPickup(0,n,nx,ny,nz,ytmp) |
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call WritePickUp(0,n,nx,ny,nz,ytmp) |
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write (*,*) 'Stepped Truth' |
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c*** step ensemble forward |
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do isai=1,nens |
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do k=1,n |
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ytmp(k)=xens(k,isai) |
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enddo |
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call WritePickUp(isai,n,nx,ny,nz,ytmp) |
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call Model(isai) |
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enddo |
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write (*,*) 'Stepped Ensemble' |
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call flush() |
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enddo |
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return |
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end |
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